Disclaimer: I am not a medical professional and this is not medical advice.
In trans adolescents, puberty-blocking GnRH agonists to halt the progression of unwanted other-sexed puberty are ideally given at Tanner stage 2 or 3 before those changes can take place, although many youth still do not obtain blockers until Tanner stage 4 or 5 – in effect, transitioning as adults. The accepted wisdom in early transition treatment holds that if blockers are started at stages 2-3, the absence of natal sex hormones means that viable gametes will not develop, and continuation onto cross-sex hormone therapy without interruption means that gametes will never develop, making fertility preservation impossible (Hembree et al., 2017):
Treating early pubertal youth with GnRH analogs will temporarily impair spermatogenesis and oocyte maturation. Given that an increasing number of transgender youth want to preserve fertility potential, delaying or temporarily discontinuing GnRH analogs to promote gamete maturation is an option. This option is often not preferred, because mature sperm production is associated with later stages of puberty and with the significant development of secondary sex characteristics.
This poses difficulties for trans youth who may wish to have biological children in the future, and this obstacle has been misused by anti-trans advocates to assert that trans youth should therefore experience none of the known benefits of early transition with puberty blockers. However, this issue may not be completely intractable: two cases have been reported of adolescent trans boys, receiving puberty blockers at stage 2, undergoing successful ovarian stimulation and retrieving viable eggs with only a brief interruption before continuing onto testosterone. Continue reading →